There were no modifications that brought on this severe change. It happened shortly after doing a huge power brake in the garage (bunches of smoke...). After that, the car sat for several months until recently when I started diving into it to see what's wrong.
I was going to suggest that you throw the old cat system back on to see if it restores your power. If you're going to be working on your ride much, you should probably invest in a simple code scanner. They're available in most Auto stores, retail for $50 or less, and give you access to read trouble codes off the ECU. You could probably even look on E-Bay and find one. It's a must have item.
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